package cn.edu.scau.cmi.dengzejun.chapter06;

public class Example6_9 {
	public static void main(String agrs[]) {
		B1 b=new B1();
		System.out.println("sum= "+b.sum(30, 20));
		System.out.println("sub= "+b.sub(30, 20));
		return;
	}
}
